// 向右移位
const shiftRight = (number, n) => {
  let digit = n;
  digit = parseInt(digit, 10);
  const value = number.toString().split("e");
  return +`${value[0]}e${value[1] ? +value[1] + digit : digit}`;
};

// 向左移位
const shiftLeft = (number, n) => {
  let digit = n;
  digit = parseInt(digit, 10);
  const value = number.toString().split("e");
  return +`${value[0]}e${value[1] ? +value[1] - digit : -digit}`;
};

// 阿拉伯数字转大写中文金额
const digitUppercase = (arabic) => {
  let n = arabic;
  const fraction = ["角", "分"];
  const digit = ["零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"];
  const unit = [
    ["元", "万", "亿", "万亿", "亿亿"],
    ["", "拾", "佰", "仟"],
  ];
  const head = n < 0 ? "负数" : "";
  n = Math.abs(n);
  let s = "";
  const list = [];
  for (let i = 0; i < fraction.length; i++) {
    const fractionStr =
      digit[Math.floor(shiftRight(n, 1 + i)) % 10] + fraction[i];
    console.log("fractionStr: ", fractionStr);
    list.push(fractionStr);
    if (list[0] === "零角" && list[1] !== "零分") {
      s += `零${list[1] || ""}`;
    } else if (list[0] === "零角" && list[1] === "零分") {
      console.log(list);
      s = "";
    } else {
      s += fractionStr.replace(/零./, "");
    }
  }
  s = s || "整";
  n = Math.floor(n);
  for (let i = 0; i < unit[0].length && n > 0; i++) {
    let p = "";
    for (let j = 0; j < unit[1].length && n > 0; j++) {
      p = digit[n % 10] + unit[1][j] + p;
      n = Math.floor(shiftLeft(n, 1));
    }
    s = p.replace(/(零.)*零$/, "").replace(/^$/, "零") + unit[0][i] + s;
  }
  return (
    head +
    s
      .replace(/(零.)*零元/, "元")
      .replace(/(零.)+/g, "零")
      .replace(/^整$/, "零元整")
  );
};

export default digitUppercase;
